CVEvulnerability
CVE-2025-39838
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2025-09-19
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-476
Description
In the Linux kernel, the following vulnerability has been resolved:
cifs: prevent NULL pointer dereference in UTF16 conversion
There can be a NULL pointer dereference bug here. NULL is passed to
__cifs_sfu_make_node without checks, which passes it unchecked to
cifs_strndup_to_utf16, which in turn passes it to
cifs_local_to_utf16_bytes where '*from' is dereferenced, causing a crash.
This patch adds a check for NULL 'src' in cifs_strndup_to_utf16 and
returns NULL early to prevent dereferencing NULL pointer.
Found by Linux Verification Center (linuxtesting.org) with SVACE
Affected configurations
• linux linux kernel (>= 6.12 < 6.12.46)
• linux linux kernel (>= 6.13 < 6.16.6)
• linux linux kernel 6.17
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness
References
- https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260 Patch
- https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a Patch
- https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0 Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html cert-portal.siemens.com